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Going into the house at the centre of the Napier siege - where gunman Jan Molenaar was today found dead - was "extremely risky," police said.

Jan Molenaar had been holed up in a two-storey Napier house since early Thursday morning when he shot three policemen and a neighbour - killing one policemen and seriously injuring the others - during what was described by police as a regulation drugs raid.

The body found in the master bedroom of the Chaucer Rd address shortly after midday today is believed to be Jan Molenaar, operation head Superintendent Sam Hoyle told a 2pm press conference.

Police found explosives at the house and would maintain extensive cordons for some time yet.

"Explosives experts are assisting us to make sure the house is safe," Mr Hoyle said.

Immediate neighbours of Molenaar were still not able to return to their homes today while there was a danger the devices might explode, Mr Hoyle said.

The roads within the new cordon are Chaucer Rd South, Guys Hill Rd, Napier Terrace (from Chaucer Rd to Spencer Rd), all of Spencer Rd and Enfield Rd.

Police say the roadblocks will be in place for one or two days

"I understand completely people's frustration with being kept out of their homes. However we ask for patience for this next period while we let the explosives experts work.

"Once they hand the scene to police so we can commence a scene examination we can review our cordons and allow more people to return to their homes."

Police entered the siege house for the first time just after 11am this morning. It was "incredibly risky" to do so, Mr Hoyle said.

"We had achieved all we could without entering by exploring other tactics. This was a last resort if you like".

No one was harmed and no shots were fired in the operation.

Mr Hoyle was not able to say how or when Molenaar died, but he did say the body was still in the house.

"Those are both questions for the pathologist and the coroner who will determine ultimately the cause of death."